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Acquisition (Schedule of Pro Forma Information) (Details) (Hornbeck Acquisition [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
Hornbeck Acquisition [Member] |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |
Revenues | $ 1,029,798
Net Income | $ 30,839

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